Question

我正在使用Google Guava API来计算字数。

public static void main(String args[])
    {
        String txt = "Lemurs of Madagascar is a reference work and field guide giving descriptions and biogeographic data for all the known lemur species in Madagascar (ring-tailed lemur pictured). It also provides general information about lemurs and their history and helps travelers identify species they may encounter. The primary contributor is Russell Mittermeier, president of Conservation International. The first edition in 1994 received favorable reviews for its meticulous coverage, numerous high-quality illustrations, and engaging discussion of lemur topics, including conservation, evolution, and the recently extinct subfossil lemurs. The American Journal of Primatology praised the second edition's updates and enhancements. Lemur News appreciated the expanded content of the third edition (2010), but was concerned that it was not as portable as before. The first edition identified 50 lemur species and subspecies, compared to 71 in the second edition and 101 in the third. The taxonomy promoted by these books has been questioned by some researchers who view these growing numbers of lemur species as insufficiently justified inflation of species numbers.";

        Iterable<String> result = Splitter.on(" ").trimResults(CharMatcher.DIGIT)
                   .omitEmptyStrings().split(txt);
        Multiset<String> words = HashMultiset.create(result);

        for(Multiset.Entry<String> entry : words.entrySet())
        {
            String word = entry.getElement();
            int count = words.count(word);
            System.out.printf("%S %d", word, count);
            System.out.println();
        }
    }

输出应为

Lemurs 3

但是我会这样：

Lemurs 1
Lemurs 1
Lemurs 1

我做错了什么？

Answer 1

使用大写为printf("%S %d", words, count)的{{1}}会隐藏“狐猴”一词的不同大写字母将被单独计算的详细信息。当我运行该程序时，我看到了

一次出现“狐猴”。没有被修剪的时期
一次出现“狐猴”全部小写
第一个字母大写的“狐猴”出现了一次

Answer 2

MultiSet运行正常。仔细查看结果 - 将printf切换为例如"|%S| %d"会有所帮助：

|lemurs.| 1
|lemurs| 1
|Lemurs| 1

很明显，这些都是3个不同的字符串。在这种情况下，解决方案是简单地删除所有非字母字符，并小写所有单词。

Google Guava MultiSet返回的值不正确

2 个答案: